When your long tail runs into the tens of thousands of phrases before permutation, you have a problem.
The trick for a successful and comprehensive long-tail PPC strategy is to be effective. Rather than permutating every possible keyword 'stem' with every possible location, build your keywords and ad groups strategically.

Like any tool, guest blogging is good for achieving certain objectives, not all of them. Too often, internet marketers try to use the wrong tool for the job and then blame the tool (or avoid a useful one that might do some good). Recognize the job you have to do, before choosing your tools.

Keyword research may be the most undervalued facet of SEO. While most webmasters will happily dedicate hours to reading backlink strategies and on-page optimization tips, very few spend the time needed to learn proper keyword research methodology.